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Show FOREFATHERS OF RADIO By GEORGE LEWIS of The C'rosley Hmlio Corporation. While a student In the postgraduate -school of Columbia university. New York city, Edwin Armstrong became interested in the development of receiving re-ceiving circuits for using the radio tube. Eight and nine-tube sets were coming into vogue, and it began to ap- i Edwin H. Armstrong. pear that soon the owner of a radio set would have to remodel his home in order to get it into one room. Armstrong Arm-strong invented a system whereby a single tube is used both as a detector and an amplifier, coils being arranged so that after the signal current has 45o o rill i -If . A-0 I REGENERATIVE TUBR gone through the detector tube once, it Is, In effect, sent back through that tube several times to be further amplified. am-plified. The result is that one detector detec-tor tube used In this way is equivalent to a detector tube and two or more j amplifier tubes used in the old way. j He called this system "regeneration." : Regenerative sets became popular j very rapidly, since a regenerative set j operates as efficiently as any other type of set using several more tubes, j They are still the most efficient type of sot today. In fact, regeneration is the technical principle which has .made it possible to manufacture the best of radio sets within the reach of the average man's pocketbook. |
